Shandongidium variabile Xu Jinli et al., 1997, p.57, pl.5, fig.5; pl.52, figs.2a–b; pl.53, figs.1a–c ex He Chengquan et al., 2009, p.365,665. Holotype: Xu Jinli et al., 1997, pl.5, fig.5. This name was not validly published in Xu Jinli et al. (1997), since no English or Latin description was provided; He Chengquan et al. (2009, p.665) validated the name by publishing an English diagnosis. Age: middle-late Eocene.